Candles appear at a memorial for Nipsey Hussle in the parking lot of his Marathon Clothing store in Los Angeles. (Associated Press)

A vigil in South Los Angeles for slain rapper Nipsey Hussle erupted in chaos Monday evening after an unknown incident caused the crowd to panic, resulting in multiple injuries, city officials said.

Fire Department spokeswoman Margaret Stewart says firefighters received a report Monday night of a possible shooting or stabbing and found one person critically wounded. The Los Angeles Police Department later said the information was not accurate.

The gunman, who was identified as a black male, has not been captured. TMZ, citing unnamed sources, reported that the gunman walked up to Hussle and the others and opened fire. He sped off in a nearby vehicle that was driven by a female. All three men were taken to hospitals.

Bradford Betz is an editor for Fox News. Follow him on Twitter @bradford_betz.